Extrusion molding of plastic profiles is an important link in plastic processing.
In the process of plastic profile extrusion, the plastic material melted and plasticized by the extruder is extruded into a preliminary profile with a certain shape and size. However, at this time, the profile temperature is higher, the shape is not completely fixed, and the size is not precise enough.
Shape processing is to cool, cure and accurately control the size of the just-extruded thermoplastic profile through a specific device and process, so that it can obtain the final desired shape, dimensional accuracy and performance.
Common setting methods include vacuum setting and water cooling setting. Vacuum shaping is the use of vacuum adsorption force to make the hot plastic profile stick to the inner wall of the mold, so as to obtain accurate shape and size. Water-cooled shaping is to quickly cool the profiles through circulating cold water to make them solidify and shape.
In the shaping process, it is also necessary to control the cooling speed and cooling uniformity to avoid internal stress, deformation or surface defects. At the same time, the design of the shaping device and the setting of the process parameters should be optimized according to the characteristics of the plastic material, the shape and size requirements of the profile and other factors to ensure the production of high-quality plastic profile products.
For example, in the production of plastic door and window profiles, through extrusion molding, the profiles can have accurate cross-section shape, smooth surface and stable size, so as to meet the assembly and use requirements of doors and Windows.
